@article{EJDE_2004__2004__a49,
     author = {Amster, Pablo and De Napoli, Pablo L. and Mariani, Maria Cristina},
     title = {Existence of solutions to $n$-dimensional pendulum-like equations},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2004},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2004__2004__a49/}
}